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A hallway under regular lighting (left) and emergency lighting (right) US-style emergency lighting fixture An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage.
While exit signs were more visible due to large letters, even a 60-watt incandescent bulb shining through a plastic or glass cover could appear somewhat dim under certain conditions. Incandescent bulbs are still in use because they are cheap and common, even though they use more electricity and require more or less frequent replacement.
LAMP LIFE . The length of time a lamp lasts is a critical factor, since lamp replacement costs (including lamp and labor costs, as well as the administrative cost of ordering lamps) will be incurred more frequently when lamps have a shorter rated life. An LED exit sign can last for 10 years with no lamp change-outs.
Emergency exit in Universitetet metro station in Stockholm. An emergency exit in a building or other structure is a special exit used during emergencies such as fires.The combined use of regular and emergency exits allows for faster evacuation, and emergency exits provide alternative means of evacuation if regular exits are inaccessible.
A cold-cathode fluorescent lamp from an emergency-exit sign. Operating at a much higher voltage than other fluorescents, the lamp produces a low-amperage glow discharge rather than an arc, similar to a neon light. Without direct connection to line voltage, current is limited by the transformer alone, negating the need for a ballast.
Emergency vehicle lighting, also known as simply emergency lighting or emergency lights, is a type of vehicle lighting used to visually announce a vehicle's presence to other road users. A sub-type of emergency vehicle equipment , emergency vehicle lighting is generally used by emergency vehicles and other authorized vehicles in a variety of ...
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